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EP1208248B1 - Verfahren zur korrsosionsinhibierung geeignet zur verwendung in trinkwasser - Google Patents

Verfahren zur korrsosionsinhibierung geeignet zur verwendung in trinkwasser Download PDF

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Publication number
EP1208248B1
EP1208248B1 EP00950666A EP00950666A EP1208248B1 EP 1208248 B1 EP1208248 B1 EP 1208248B1 EP 00950666 A EP00950666 A EP 00950666A EP 00950666 A EP00950666 A EP 00950666A EP 1208248 B1 EP1208248 B1 EP 1208248B1
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EP
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Prior art keywords
ppm
stannous
water system
stannous chloride
concentration
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Expired - Lifetime
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EP00950666A
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French (fr)
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EP1208248A1 (de
Inventor
Olen L. Riggs, Jr.
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A S Inc
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A S Inc
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
    • C02F1/683—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water by addition of complex-forming compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • C02F5/083—Mineral agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • C02F5/086—Condensed phosphates
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • C23F11/18—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using inorganic inhibitors
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • C23F11/18—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using inorganic inhibitors
    • C23F11/187—Mixtures of inorganic inhibitors
    • C23F11/188—Mixtures of inorganic inhibitors containing phosphates
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/02—Non-contaminated water, e.g. for industrial water supply
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/42—Nature of the water, waste water, sewage or sludge to be treated from bathing facilities, e.g. swimming pools
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/08—Corrosion inhibition

Definitions

  • the present invention relates to methods for inhibiting corrosion of corrodible metals present in contact with water in distributive water systems, particularly those associated with distribution of drinking water.
  • EP-A-0 265 723 discloses corrosion inhibiting compositions for use in soft water boilers.
  • EP-A-0 066 347 discloses a variety of electrolytic plating baths. In Materials Performance, US, Nace. Houston, vol 34 (1995) p.36-39 "Environmentally safe portable water treatments" are described. A method for inhibiting corrosion is also disclosed in EP-A-0 006 065.
  • the present invention includes, in one aspect, a method for inhibiting corrosion of corrodible metal in contact with water in a distributive water system.
  • a composition consisting essentially of an aqueous stannous halide solution, is added to the water, and a concentration of the stannous halide corresponding to a tin level of about 0.01 to about 75 ppm is maintained in the water system, wherein the composition does not include an alcoholic solvent.
  • the halide is preferably selected from stannous fluoride, stannous chloride, and stannous bromide, and is most preferably stannous chloride.
  • the stannous halide is added in the form of an aqueous solution.
  • the weight percent of stannous chloride in an aqueous stannous chloride solution is preferably about 5 to 90 percent, and more preferably about 40 to 80 percent.
  • the concentration of stannous chloride corresponding to a tin level of about 0.01 to about 75 ppm is about 0.016 ppm to about 120 ppm SnCl 2 ; a preferred concentration range for stannous chloride in the water system is about 0.05 to 25 ppm SnCl 2 .
  • the corrodible metal is typically a ferrous metal, a brass metal, a copper-containing metal, or a lead-containing metal.
  • the distributive water system is a municipal drinking water system.
  • Such a system may initially contain an alkali metal phosphate, such as a pyrophosphate, an orthophosphate, a hexametaphosphate, a hypophosphate, a polyphosphate, or a combination thereof, typically in an amount effective to provide a concentration of about 0.01 ppm to about 5 ppm of the alkali metal phosphate in the water system.
  • the water system may also be treated to contain at least one component selected from a dispersing agent, a chelating agent, and a biocide.
  • the invention provides a related method for inhibiting corrosion of corrodible metal in contact with water in a distributive water system.
  • stannous halide alone, a composition consisting essentially of an aqueous stannous halide solution, is added to the water system, in combination with an alkali metal phosphate selected from a pyrophosphate, an orthophosphate, a hexametaphosphate, a hypophosphate, and a polyphosphate, wherein the composition does not include an alcoholic solvent.
  • a concentration of the stannous halide corresponding to a tin level of about 0.01 to about 75 ppm is maintained in the water system.
  • stannous chloride is the preferred halide, and is preferably maintained at a level of about 0.05 ppm to about 25 ppm in the water system.
  • the alkali metal phosphate e.g. sodium hexametaphosphate or sodium orthophosphate, is typically present in an amount effective to provide a concentration of about 0.01 ppm to about 5 ppm in the water system.
  • the invention provides a metal corrosion inhibiting composition, consisting essentially of (i) an aqueous stannous halide solution and (ii) an alkali metal phosphate selected from a pyrophosphate, an orthophosphate, a hexametaphosphate, a hypophosphate, and a polyphosphate, wherein the composition does not include an alcoholic solvent.
  • the stannous halide is stannous chloride, and the stannous chloride and alkali metal phosphate are present in relative amounts effective to produce concentrations of about 0.05 ppm to about 25 ppm and about 0.01 ppm to about 5 ppm, respectively, in a distributive water system.
  • the composition may also include one or more substances typically added to a distributive water stream for purposes other than inhibition of corrosion, such as a dispersing agent, chelating agent, or biocide.
  • the composition includes an acrylate copolymer, e.g. an acrylate/sulfonate copolymer.
  • Corrosion of a metal in contact with water refers to degradation of the metal due to chemical reaction with its environment, in this case, water and substances present in the water, including air. Such corrosion ultimately leads to dissolution or dispersion of the metal or metal compound in the water, observed as a loss of mass of the metal.
  • aqueous stannous halide or “an aqueous stannous halide solution” refers to a composition of stannous halide in water, typically in fairly high concentration, i.e., about 30 weight percent or greater.
  • the composition may include an acid, e.g. HCl, to promote dissolution of the stannous halide. There are no other components in any appreciable concentration.
  • a “composition consisting essentially of" stannous halide refers to stannous halide (or an aqueous stannous halide solution) in combination with one or more optional components which do not materially affect the metal corrosion inhibiting characteristic(s) of the composition.
  • Such components would typically be substances added to a distributive water stream for purposes other than inhibition of corrosion, as defined above.
  • dispersing or chelating agents such as soluble anionic polymers (e.g. polyacrylates or acrylate copolymers), may be employed to reduce scale formation on solid surfaces; biocides may be added to reduce microbial growth.
  • compositions consisting essentially of stannous halide (or an aqueous stannous halide solution) and an alkali metal phosphate. Such compositions may also include components present for purposes other than inhibition of corrosion.
  • halide in the above definitions is selected from fluoride, chloride, bromide, or iodide; he halide is preferably fluoride, chloride, or bromide, and is most preferably chloride.
  • a “concentration of stannous halide which corresponds to a concentration of tin" in a given concentration range is determined from the relative molecular weights of the components, for example: 0.010 ppm tin corresponds to approx. 0.013 ppm SnF 2, 0.016 ppm SnCl 2 , or 0.023 ppm SnBr 2 ; 0.150 “ 0.20 “ 0.24 “ 0.35 “ 1.0 " 1.32 “ 1.60 “ 2.34 " 10 " 13.2 “ 16.0 “ 23.4 " 75 “ 99 “ 120 “ 176 "
  • water contained in a distributive water system to which a corrosion inhibitor is added is referred to as the "water system”, rather than simply “water”, to avoid confusion with the concentrated aqueous stannous halide solutions.
  • any stannous halide or preferably a concentrated aqueous solution of the stannous halide, may be used. Because stannous iodide has a relatively low aqueous solubility, stannous fluoride, bromide, and chloride are preferred. For reasons of solubility and stability, stannous chloride is particularly preferred.
  • Highly concentrated aqueous stannous chloride solutions i.e. up to 90 weight percent SnCl 2
  • SnCl 2 may be conveniently prepared by adding water to stannous chloride in the desired weight ratio and stirring for a brief period of time. Dissolution is enhanced by using water which is slightly acidic. Such a solution may then be added to a distributive water system in an amount needed to produce a desired concentration of SnCl 2 , e.g. about 0.05 ppm to about 25 ppm (about 0.03 to 16 ppm tin), in the water system. The concentration of SnCl 2 in the water system may then be monitored, by techniques known in the art, and adjusted as necessary to maintain the desired concentration.
  • Aqueous stannous chloride solutions containing 50 weight percent SnCl 2 were prepared by adding water to the solid, in the manner described above. In the following experiments, samples of these solutions were added to samples of municipal drinking water effective to provide final concentrations of 0.15 to 1.0 ppm stannous chloride in the water, as shown.
  • Table 3 shows corrosion rates in MPY (1 mil per year corresponds to 2,54 x 10 -5 m per year) for various metals in OKC water (aerated at 49°C (120°F), as described for Table 2) containing 3 ppm hexametaphosphate (as received) with and without other additives.
  • the results show that increasing the amount of phosphate had variable results, depending on the metal tested; in some cases corrosion increased (e.g. for lead).
  • Addition of zinc chloride gave moderate improvements, except in the case of lead.
  • Addition of stannous chloride however, reduced corrosion significantly, as is most apparent from a comparison of the 3 rd and 5 th data columns.
  • Table 4 gives further data for carbon steel corrosion (aerated at 49°C (120°F), as described above), showing combinations of SnCl 2 with varying amounts of phosphate. As shown in the Table, addition of SnCl 2 reduced corrosion in all cases, although it appeared to be more effective at lower levels (3 ppm vs. 6 ppin) of phosphate.
  • (Carbon Steel) ppm HMP ppm SnCl 2 Corrosion, MPY 3 (as received) 0 41.3 3 . 0.25 6.8 3 0.50 7.6 6 (3 ppm added) 0 29.5 6 0.25 13.3 6 0.50 11.4 3 (as received, plus 3 ppm OP added) 0.25 11.1
  • the present anticorrosive stannous halide compositions may be used in combination with components which do not materially affect the metal corrosion inhibiting characteristic(s) of the composition.
  • Such components would typically be substances added to a distributive water stream for purposes other than inhibition of corrosion.
  • dispersing or chelating agents such as soluble anionic polymers (e.g. polyacrylates or acrylate copolymers) may be employed to reduce scale formation on solid surfaces.
  • soluble anionic polymers e.g. polyacrylates or acrylate copolymers
  • Acumer® 2100 Rosulfonate copolymer
  • the metal coupons were copper (CDA-110), and the water was municipal drinking water from LaSalle, IL, which contained no phosphate additives. Test conditions were as described in Materials and Methods, below (49°C (120°F), aerated water, 7 days duration).
  • the copolymer had no adverse properties on the corrosion inhibiting properties of SnCl 2 . Although larger concentrations of the copolymer alone appeared to increase corrosion, this effect was very effectively counteracted by the presence of SnCl 2 .
  • Table 6 Also shown in Table 6 is a combination of SnCl 2 with AMP (aminotris(methylenephosphonic acid); Mayoquest® 1320), which is useful in scale control by sequestering calcium and magnesium as well as ferrous ion. Again, the metal coupon showed very low corrosion in the presence of this additive and low concentrations of SnCl 2 .
  • AMP aminotris(methylenephosphonic acid); Mayoquest® 1320
  • aqueous stannous chloride is an extremely effective corrosion inhibitor both as a sole additive and in the presence of other substances commonly employed in municipal drinking water supplies, such as alkali metal phosphates, dispersants and metal chelators. Therefore, stannous chloride may be added to systems containing such additives, or it may be added concurrently with the additives.
  • stannous chloride may be added to systems containing such additives, or it may be added concurrently with the additives.
  • a typical corrosion test was carried out in the following manner.
  • the test sample of municipal drinking water was placed in a one liter resin kettle equipped to hold (1) a jacketed water cooled condenser, (2) a mounted air-injection gas tube, and (3) a holder from which the test specimen was suspended and totally immersed in the test water.
  • the complete assembly was placed in a constant temperature oil bath.
  • the test water was agitated by compressed air at a flow rate of 7,1 m 3 /s (1.5 ft 3 /min).
  • the temperature was maintained at 49°C (120°F) for seven days.
  • Test coupons were generally 2,54 cm x 5,08 cm x 0,16 cm (1" x 2" x 1/16") in size, with a 0,64 cm (1 ⁇ 4") mounting hold centered 0.64 cm (1 ⁇ 4") from one end.
  • the test coupons were weighed before and after testing, and weight loss in milligrams was converted to a corrosion rate of milliinches per year (mpy), wherein 1 mil par year corresponds to 2,54 x 10 -5 m per year.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
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  • Inorganic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
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  • Health & Medical Sciences (AREA)
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  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Water Treatment By Sorption (AREA)
  • Treatment Of Water By Ion Exchange (AREA)

Claims (20)

  1. Verfahren zur Korrosionsinhibierung von korrodierbarem Metall, das mit Wasser in einem Wasserverteilungssystem in Kontakt ist, umfassend
    (a) Zugeben einer Zusammensetzung, die im Wesentlichen aus einer wässrigen Zinn(II)halogenidlösung besteht, zu dem Wassersystem, wobei die Zusammensetzung kein alkoholisches Lösungsmittel einschließt, und
    (b) Beibehalten einer Konzentration des Zinn(II)halogenids in dem Wassersystem, die einer Zinnkonzentration zwischen 0,01 ppm und 75 ppm entspricht.
  2. Verfahren nach Anspruch 1, wobei das Zinn(II)halogenid aus Zinn(II)fluorid, Zinn(II)chlorid und Zinn(II)bromid ausgewählt ist.
  3. Verfahren nach Anspruch 2, wobei das Zinn(II)halogenid Zinn(II)chlorid ist und die Konzentration an Zinn(II)chlorid in dem Wassersystem bei 0,015 ppm bis 120 ppm beibehalten wird.
  4. Verfahren nach Anspruch 3, wobei die Konzentration an Zinn(II)chlorid in dem Wassersystem bei 0,05 ppm bis 25 ppm beibehalten wird.
  5. Verfahren nach Anspruch 3, wobei in Schritt (a) Zinn(II)chlorid in Form einer wässrigen Zinn(II)chloridlösung zugegeben wird.
  6. Verfahren nach Anspruch 5, wobei der Gewichtsprozentsatz an Zinn(II)chlorid in der wässrigen Zinn(II)chloridlösung 5 bis 90 % beträgt.
  7. Verfahren nach Anspruch 6, wobei der Gewichtsprozentsatz 40 bis 80 % beträgt.
  8. Verfahren nach Anspruch 1, wobei das korrodierbare Metall aus einem eisenhaltigen Metall, einem Messingmetall, einem kupferhaltigen Metall und einem bleihaltigen Metall ausgewählt ist.
  9. Verfahren nach Anspruch 1, wobei das Wasserverteilungssystem ein städtisches Trinkwassersystem ist.
  10. Verfahren nach Anspruch 1, wobei das Wassersystem ein Alkalimetallphosphat, ausgewählt aus einem Pyrophosphat, einem Orthophosphat, einem Hexametaphosphat, einem Hypophosphat und einem Polyphosphat, enthält.
  11. Verfahren nach Anspruch 10, wobei das Alkalimetallphosphat in einer Menge vorhanden ist, die wirksam ist, eine Konzentration von 0,01 ppm bis 5 ppm in dem Wassersystem bereitzustellen.
  12. Verfahren zur Korrosionsinhibierung von korrodierbarem Metall, das in einem Wasserverteilungssystem mit Wasser in Kontakt ist, umfassend
    (a) Zugeben einer Zusammensetzung, die im Wesentlichen aus (i) einer wässrigen Zinn(II)halogenidlösung und (ii) einem Alkalimetallphosphat, ausgewählt aus einem Pyrophosphat, einem Orthophosphat, einem Hexametaphosphat, einem Hypophosphat und einem Polyphosphat, besteht, zu dem Wassersystem, wobei die Zusammensetzung kein alkoholisches Lösungsmittel einschließt, und
    (b) Beibehalten einer Konzentration des Zinn(II)halogenids in dem Wassersystem, die einer Zinnkonzentration zwischen 0,01 ppm und 75 ppm entspricht.
  13. Verfahren nach Anspruch 12, wobei das Zinn(II)halogenid aus Zinn(II)fluorid, Zinn(II)chlorid und Zinn(II)bromid ausgewählt ist.
  14. Verfahren nach Anspruch 13, wobei das Zinn(II)halogenid Zinn(II)chlorid ist und die Konzentration an Zinn(II)chlorid in dein Wassersystem bei 0,015 ppm bis 120 ppm beibehalten wird.
  15. Verfahren nach Anspruch 14, wobei die Konzentration an Zinn(II)chlorid bei 0,05 ppm bis 25 ppm beibehalten wird.
  16. Verfahren nach Anspruch 13, wobei in Schritt (a) Zinn(II)chlorid in Form einer wässrigen Zinn(II)chloridlösung zugegeben wird.
  17. Verfahren nach Anspruch 12, wobei das Alkalimetallphosphat in einer Menge zugegeben wird, die wirksam ist, eine Konzentration von 0,01 ppm bis 5 ppm in dem Wassersystem bereitzustellen.
  18. Verfahren nach Anspruch 12, wobei das Alkalimetallphosphat Natriumhexametaphosphat oder Natriumorthophosphat ist.
  19. Zusammensetzung zur Metallkorrosionsinhibierung, bestehend aus (i) einer wässrigen Zinn(II)chloridlösung mit einer Zinn(II)chlorid-Konzentration von 5 bis 90 Gew.-% und (ii) einem Alkalimetallphosphat, ausgewählt aus einem Pyrophosphat, einem Orthophosphat, einem Hexametaphosphat, einem Hypophosphat und einem Polyphosphat, wobei die Zusammensetzung kein alkoholisches Lösungsmittel einschließt; wobei das Zinn(II)chlorid und das Alkalimetallphosphat in. relativen Mengen vorliegen, die wirksam sind, in einem Wasserverteilungssystem Endkonzentrationen von 0,05 ppm bis 25 ppm bzw. 0,01 ppm bis 5 ppm zu erzeugen, wenn eine Probe der Zusammensetzung zu dem Wasserverteilungssystem zugegeben wird.
  20. Zusammensetzung nach Anspruch 19, wobei die wässrige Zinn(II)chloridlösung eine Konzentration von 40 bis 80 Gew.-% aufweist.
EP00950666A 1999-07-26 2000-07-25 Verfahren zur korrsosionsinhibierung geeignet zur verwendung in trinkwasser Expired - Lifetime EP1208248B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US360768 1999-07-26
US09/360,768 US6200529B1 (en) 1998-12-31 1999-07-26 Corrosion inhibition method suitable for use in potable water
PCT/US2000/020231 WO2001007682A1 (en) 1999-07-26 2000-07-25 Corrosion inhibition method suitable for use in potable water

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EP1208248A1 EP1208248A1 (de) 2002-05-29
EP1208248B1 true EP1208248B1 (de) 2005-05-25

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US (1) US6200529B1 (de)
EP (1) EP1208248B1 (de)
JP (1) JP2003505597A (de)
AT (1) ATE296365T1 (de)
AU (1) AU6373900A (de)
CA (1) CA2380325A1 (de)
DE (1) DE60020377T2 (de)
WO (1) WO2001007682A1 (de)

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WO2001007682A1 (en) 2001-02-01
US6200529B1 (en) 2001-03-13
DE60020377T2 (de) 2006-02-02
ATE296365T1 (de) 2005-06-15
AU6373900A (en) 2001-02-13
CA2380325A1 (en) 2001-02-01
EP1208248A1 (de) 2002-05-29
JP2003505597A (ja) 2003-02-12
DE60020377D1 (de) 2005-06-30

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